Valve Spring - HR Series (1)

The PAC Racing Springs Valve Spring HR Series is designed for high-RPM engine applications, ensuring valve control and reliability through precision engineering. This single valve spring is ideal for street performance engines, weekend track cars, and competition powerplants, delivering consistent load rates and harmonics to maintain valvetrain stability during high-speed operation.

Constructed from premium spring steel and manufactured to strict tolerances, the HR Series valve spring effectively resists coil bind, surge, and resonance issues that can affect performance under sustained RPM loads. Its progressive rate design ensures consistent seat pressure while preventing over-compression as valve lift increases, which is crucial for extending the life of valves and rocker arms.

Engine builders and performance mechanics trust PAC Racing Springs valve springs for their reliability, especially when cam lift and duration require a robust valvetrain component. This single spring is sold individually, so it’s important to verify your application requirements and total spring count before ordering.